EP1405004B1 - System for thermally insulating tubular bodies - Google Patents

System for thermally insulating tubular bodies Download PDF

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Publication number
EP1405004B1
EP1405004B1 EP02741183A EP02741183A EP1405004B1 EP 1405004 B1 EP1405004 B1 EP 1405004B1 EP 02741183 A EP02741183 A EP 02741183A EP 02741183 A EP02741183 A EP 02741183A EP 1405004 B1 EP1405004 B1 EP 1405004B1
Authority
EP
European Patent Office
Prior art keywords
evacuated
panels
insulating system
panel
heat insulating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02741183A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1405004A1 (en
Inventor
Paolo Manini
Pierattilio Di Gregorio
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SAES Getters SpA
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SAES Getters SpA
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Publication of EP1405004A1 publication Critical patent/EP1405004A1/en
Application granted granted Critical
Publication of EP1405004B1 publication Critical patent/EP1405004B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F16L59/065—Arrangements using an air layer or vacuum using vacuum

Definitions

  • the present invention relates to a system for thermally insulating tubular bodies, such as for example pipes for transporting cold or hot fluids see, for instance, US-A-6 110 310.
  • thermally insulating systems are known.
  • a material having low thermal conductivity such as mineral wool, glass wool or polyurethane, can be placed.
  • the insulating properties of such materials are not very high, and in some cases it is necessary to use great thicknesses thereof for maintaining constant the internal temperature of the body.
  • This is for instance the case of undersea pipes for transporting crude oil, that are generally formed by two coaxial tubes of stainless steel in which the oil flows in inner tube, while the outer one acts as a protection.
  • the lifting temperature comprised between about 60 and 90 °C, and therefore in the interspace between the two tubes a great amount of insulating material is to be inserted.
  • the interspace between the coaxial tubes may be evacuated so as to exploit the low thermal conductivity of vacuum with a view to achieve the insulation of the pipe.
  • the construction of the pipe becomes more complex, and it is necessary that in the same interspace is placed a getter material able to absorb the gases that during time may outgas from the steel forming both tubes.
  • the envelope serves to prevent (or reduce to the highest degree) the entrance of atmospheric gases into the panel, so as to maintain a vacuum level that is compatible with the thermal insulation degree required by the application.
  • the envelope is made of so-called "barrier" foils, characterized by a gas permeability reduced to the highest degree, that can be formed by a single component, but more usually are multilayers of different components. In the case of multilayers, the "barrier" effect is given by one of the component layers, whereas the other layers have generally the function of mechanically supporting and protecting the barrier layer.
  • the filling material on the contrary has mainly the function of maintaining the opposed faces of the envelope spaced out when a vacuum is made in the panel, and must have a porous or uneven internal structure so that the porosities or spaces thereof may be evacuated to perform the insulating function.
  • This material can be inorganic, such as for example silica powder, glass fibers, aerogels, diatomaceous earth, etc.; or polymeric, such as polyurethane or polystyrene rigid foams, both in the form of boards and powders.
  • evacuated panels lie in that they do not provide an adequate insulation to tubular bodies. As a matter of fact, they have generally a plane shape and must therefore be bent up to set side by side two opposed edges, in order to fit them to the tubular form of the inner interspace of oil ducts.
  • an evacuated panel curved in this manner does not allow to perfectly insulate the inner tube of the pipe, and in particular the zone corresponding to the edges that are set aside may become poorly insulated. In that zone in particular it can occur a cooling of inner tube and consequently also the oil flowing in inner tube get cold, thus thickening and causing a partial obstruction in the pipe.
  • the object of the present invention is therefore to provide an insulating system for tubular bodies, which is free of such inconveniences. Said object is achieved by means of an insulating system whose main characteristics are specified in the first claim, and further features are specified in the subsequent claims.
  • the insulating system according to the present invention can be easily constructed and comprises at least two thin evacuated panels that are mutually superimposed and placed so as to perfectly insulate a tubular body, with at least one of the evacuated panels of the insulating system comprising as a filling material a polymeric material, whereas at least another panel uses as filling material a powder of an inert material having a mean particle size of less than 100 nanometers (nm) and preferably comprised between about 2 and 20 nm.
  • the insulating system according to such an embodiment of the invention is particularly suited to insulate a tubular body having a temperature very different from that of the surrounding environment, for instance a pipeline wherein an oil flows at the lifting temperature and which is plunged in water on a sea depth.
  • the panels comprising said inert powders withstand actually the high temperatures better than the ones comprising polymeric filling materials and can thus be put as a protection of these latter, whose insulating characteristics would change in an unpredictable way if exposed for a long time to high temperatures, with marked aging phenomena.
  • the panels based on inert powders undergo less changes in thermal insulating characteristics in case of cracks.
  • the thermal conductivity of panels comprising inert powders changes only slightly upon entrance of air, thus remaining below about 8 mW/m ⁇ K for internal pressures up to some tens of mbars, and reaching a maximum value of about 20 mW/m ⁇ K in the case the internal pressure reaches 1 bar.
  • the thermal conductivity rises quickly from about 10 mW/m ⁇ K when the internal pressure is about 1 mbar, up to about 35 mW/m ⁇ K at atmospheric pressure. For this reason, while for the first panels it is necessary to use envelopes containing aluminum foils, for the second ones the more resistant envelopes of plastic multilayer may be used.
  • the pipe wherein the insulating system according to the present invention is installed is formed in a known manner by an inner tube 1 and an outer tube 2, being coaxial with inner tube 1 and having such a diameter that between said tubes an interspace 3 is present.
  • inner tube 1 the fluid to be insulated, for example oil, is let flow.
  • the tubes 1 and 2 can be made of any suitable material, for example stainless steel in the case of undersea pipes for transporting oil.
  • interspace 3 two evacuated panels 4 and 4' are disposed, each of which is rolled up so as to set side by side its two opposed edges 5 and 5' that are parallel to the rolling axis.
  • the evacuated panels 4 and 4' take a tubular arrangement and fit with the tubular form of the interspace.
  • said opposed edges 5 and 5' may be mutually sealed by any known means, for instance by hot sealing.
  • the two so rolled panels 4 and 4' become reciprocally inserted, in such a way that the edges 5 of panel 4 are staggered with respect to edges 5' of panel 4', and are preferably arranged in a position diametrically opposed with respect to said edges 5'.
  • end edges 6 of rolled panel 4 are staggered with respect to end edges 6' of rolled panel 4', as it appears from figure 2.
  • Such a staggered arrangement allows to obtain a substantially even thermal insulation, as the heat passage between the outer environment and the body to be insulated, that could occur through the poorly insulating zone of the edges of a panel, is prevented thanks to the presence of the other panel.
  • the heat retaining quality is assured by the presence of the other panel.
  • the insulating system may also comprise more than two panels, for example three or four.
  • Said panels can comprise a conventional envelope, for instance of the multilayer type, and an inorganic or polymeric, discontinuous or porous, filling material
  • the evacuated panels are of two types: at least a panel comprises a polymeric, for example polyurethanic, filling material, whereas at least another panel uses as the filling material an inert powder having mean particle dimensions below 100 nm and preferably between about 2 and 20 nm.
  • Said powder is preferably silica.
  • a silica having the desired dimensional characteristics can be obtained by precipitation from alkali solutions of silicates; this kind of silica is produced and sold for instance by the English company Microtherm International Ltd., under the names Microtherm G, Microtherm Super G or Waterproof Microtherm Super G.
  • the silica produced in this reaction is in the form of particles having dimensions comprised between few nanometers and some tens of nanometers, which can be possibly bound to form particles having larger dimensions.
  • a pyrogenic silica is produced and sold for example by the US company CABOT Corp. under the name Nanogel® or by the German company Wacker GmbH.
  • the silica can be possibly mixed with mineral fibers, for example glass fibers, so that it can be easily consolidated in order to prepare blocks with a thickness of even few millimeters, which blocks can be enveloped, evacuated and subsequently rolled with relative ease.
  • mineral fibers for example glass fibers
  • panel 4 comprises preferably an inert filling material, while panel 4' is based on a polymeric filling material.
  • the present invention relates to the insulation of a conduit for piping oil
  • the insulating system according to the present invention can be used to insulate any other body having tubular shape, for example a boiler or a pipe for transporting a cryogenic fluid such as liquid nitrogen or oxygen.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Insulation (AREA)
  • Building Environments (AREA)
EP02741183A 2001-07-09 2002-06-25 System for thermally insulating tubular bodies Expired - Lifetime EP1405004B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI20011458 2001-07-09
IT2001MI001458A ITMI20011458A1 (it) 2001-07-09 2001-07-09 Sistema per l'isolamento termico di corpi tubolari
PCT/IT2002/000417 WO2003006871A1 (en) 2001-07-09 2002-06-25 System for thermally insulating tubular bodies

Publications (2)

Publication Number Publication Date
EP1405004A1 EP1405004A1 (en) 2004-04-07
EP1405004B1 true EP1405004B1 (en) 2005-08-31

Family

ID=11448028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02741183A Expired - Lifetime EP1405004B1 (en) 2001-07-09 2002-06-25 System for thermally insulating tubular bodies

Country Status (18)

Country Link
US (1) US7036531B2 (ru)
EP (1) EP1405004B1 (ru)
JP (1) JP2004534192A (ru)
KR (1) KR100591466B1 (ru)
CN (1) CN1299043C (ru)
AR (1) AR034741A1 (ru)
AT (1) ATE303555T1 (ru)
CA (1) CA2446560C (ru)
DE (1) DE60205908T2 (ru)
ES (1) ES2247346T3 (ru)
IT (1) ITMI20011458A1 (ru)
MX (1) MXPA04000213A (ru)
NO (1) NO329983B1 (ru)
OA (1) OA12565A (ru)
RU (1) RU2260740C2 (ru)
TW (1) TW533291B (ru)
WO (1) WO2003006871A1 (ru)
ZA (1) ZA200308732B (ru)

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DE10353382A1 (de) * 2003-11-14 2005-06-16 Linde Ag Speicherbehälter für kryogene Medien
FR2869972B1 (fr) * 2004-05-07 2006-08-11 Saipem S A Sa Complexe isolant a enveloppe metallique pour conduite
JP2006175682A (ja) * 2004-12-21 2006-07-06 Tokai Rubber Ind Ltd 低透過性複合ホース
US20060196568A1 (en) * 2005-01-10 2006-09-07 Leeser Daniel L Flexible, compression resistant and highly insulating systems
US20070102055A1 (en) * 2005-02-23 2007-05-10 Aspen Aerogels, Inc. Composites based on macro and nanoporous materials
US20060207673A1 (en) * 2005-03-18 2006-09-21 O'brien John V Vacuum insulated assured flow piping
US20060272727A1 (en) * 2005-06-06 2006-12-07 Dinon John L Insulated pipe and method for preparing same
US7699078B1 (en) 2006-02-16 2010-04-20 Husmann Jr Jackie Thermally insulated ductwork and method of manufacture
GB0719215D0 (en) * 2007-10-02 2007-11-14 Wellstream Int Ltd Thermal insulation of flexible pipes
CN102066824B (zh) 2008-05-01 2014-07-09 卡伯特公司 隔离管或其元件的制造和安装
US8397765B2 (en) * 2008-07-25 2013-03-19 Shawcor Ltd. High temperature resistant insulation for pipe
JP5245710B2 (ja) * 2008-10-17 2013-07-24 三菱電機株式会社 真空断熱材
JP5351112B2 (ja) * 2009-09-02 2013-11-27 ニチアス株式会社 断熱材
IT1402787B1 (it) * 2010-11-23 2013-09-18 Everlux S R L Rivestimento isolante tubolare per tubazioni, e procedimento per realizzare tale rivestimento tubolare
IN2012DE00735A (ru) * 2012-03-14 2015-08-21 Gamesa Innovation & Tech Sl
NO335610B1 (no) * 2013-03-27 2015-01-12 Vetco Gray Scandinavia As Innretning for termisk isolering av ett eller flere elementer i en undersjøisk installasjon fra omgivende kaldt havvann
JP6385748B2 (ja) * 2014-07-24 2018-09-05 東京エレクトロン株式会社 熱処理装置及び熱処理方法
US10435136B2 (en) * 2016-02-19 2019-10-08 Bell Helicopter Textron Inc. Driveshaft thermal barrier
EP3354959B1 (en) * 2017-01-31 2019-11-06 Powerpipe Systems AB Improved pipe insulation
ES2937065T3 (es) * 2019-02-22 2023-03-23 Uponor Innovation Ab Tubería aislada
RU193768U1 (ru) * 2019-08-02 2019-11-14 федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный технический университет" (ДГТУ) Композитная вакуумная оболочка теплоаккумуляционной емкости
US11359759B2 (en) * 2020-09-01 2022-06-14 Saudi Arabian Oil Company Passive thermal diode for transportation pipelines using contact switch based on shape memory polymer (SMP-PTD)
US11608940B2 (en) 2020-09-01 2023-03-21 Saudi Arabian Oil Company Passive thermal diode for transportation pipelines using contact switch based on polymer thermal expansion (PTE-PTD)
US11402051B2 (en) 2020-09-01 2022-08-02 Saudi Arabian Oil Company System for installing insulation sleeves on pipelines
US11548784B1 (en) 2021-10-26 2023-01-10 Saudi Arabian Oil Company Treating sulfur dioxide containing stream by acid aqueous absorption
JP7133250B1 (ja) * 2021-12-07 2022-09-08 和幸 前田 管と容器の断熱装置と断熱方法
US11926799B2 (en) 2021-12-14 2024-03-12 Saudi Arabian Oil Company 2-iso-alkyl-2-(4-hydroxyphenyl)propane derivatives used as emulsion breakers for crude oil
DE102022130725A1 (de) 2022-10-24 2024-04-25 Liebherr-Hausgeräte Ochsenhausen GmbH Wärmeisoliertes Erzeugnis
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Also Published As

Publication number Publication date
NO20035167L (no) 2003-11-21
CN1516795A (zh) 2004-07-28
EP1405004A1 (en) 2004-04-07
CN1299043C (zh) 2007-02-07
KR100591466B1 (ko) 2006-06-20
DE60205908T2 (de) 2006-06-08
ITMI20011458A1 (it) 2003-01-09
OA12565A (en) 2006-06-07
KR20040019044A (ko) 2004-03-04
DE60205908D1 (de) 2005-10-06
TW533291B (en) 2003-05-21
JP2004534192A (ja) 2004-11-11
MXPA04000213A (es) 2004-05-04
WO2003006871A1 (en) 2003-01-23
NO20035167D0 (no) 2003-11-21
US20040134556A1 (en) 2004-07-15
ATE303555T1 (de) 2005-09-15
ITMI20011458A0 (it) 2001-07-09
ZA200308732B (en) 2004-09-14
NO329983B1 (no) 2011-01-31
RU2004103536A (ru) 2005-04-27
CA2446560C (en) 2007-09-11
US7036531B2 (en) 2006-05-02
AR034741A1 (es) 2004-03-17
ES2247346T3 (es) 2006-03-01
CA2446560A1 (en) 2003-01-23
RU2260740C2 (ru) 2005-09-20

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